| 摘要 |
A traffic light backup system for use with a traffic light is described. The traffic light backup system includes an auxiliary light associated with at least one of the enclosure housing the traffic lights and rechargeable batteries associated with the auxiliary light. A power failure is detected b y monitoring the voltage across the bulbs of the traffic lights and also preferably by monitoring the current in the common, neutral lead. When a pow er failure has been detected, the traffic light backup system engages and the auxiliary light is powered by the rechargeable batteries, preferably in a flashing fashion. In a preferred embodiment, the auxiliary light consists of a plurality of LEDs arranged in an octogonal manner. The LEDs have a high luminosity and lower power consumption, which makes them well suited for use even in broad daylight.
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